I took the serious risk of correcting a friend today (privately, via Twitter DM) in regard to his use of “their/they’re”, and “your/you’re”. I told him, “s/your/you’re/ – s/thats/that’s. Believe it or not, English matters a lot to some people.” In retrospect I should have added a smiley face or something, so as to counter any Internet-generated harshness…